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2. Laser altimeter;Vaughan;Marconi Instruments, GB,1969
3. The Optocator: High Precision, Non-contacting System for Dimension and Surface Measurement and Control;Morander,1980
4. Influence of reflecting surface characteristics on a laser rangefinder;Veret;Radio Electronic Engineering, GB,1970
5. Progress in the Application of Lasers to Distance Measurement;Harris,1965